I have been digging deep to try and find the answer here and on Google...hopefully someone can help.
What I am trying to do is connect to MySQL from a Google Spreadshee
Sigh...The solution was right in front of my face. I needed to grant the Google App Server IPs. Im sure you could add more code to connect over ssh and its more secure but this is fine for now.
Here are IP address range:
216.239.32.0 - 216.239.63.255 64.233.160.0 - 64.233.191.255 66.249.80.0 - 66.249.95.255 72.14.192.0 - 72.14.255.255 209.85.128.0 - 209.85.255.255 66.102.0.0 - 66.102.15.255 74.125.0.0 - 74.125.255.255 64.18.0.0 - 64.18.15.255 207.126.144.0 - 207.126.159.255 173.194.0.0 - 173.194.255.255
https://developers.google.com/apps-script/jdbc#accessing_local_databases
I know this was a firewall issue but I am sharing in case others want a free JDBC tool that is able to pull in data into your Google Spreadsheet. You are able to create queries and refresh your content all in one tool.
You can find it here. Google Spreadsheet JDBC Connector